telephone lightning arrestors [RE-wrenches]

[Jeff Irish]

Telephone lines are nominal 48 VDC with positive ground.  You can measure
this when the line is "on hook" (not in use); it's kind of like an open
circuit voltage.  The AC Carl refers to is the superimposed ring signal, 2
seconds on, 4 seconds off.  This can give you a buzz.  If the line is "off
hook" (in use), you'll measure a much lower DC voltage and both lines will
be referenced away from ground.

I think places like radio shack sell inexpensive surge protectors and
capacitors for telephone lines; give them a call.

Jeff Irish

-----Original Message-----
From: Carl Hansen [mailto:Solarwks at cybermesa.com] 
Sent: Monday, February 26, 2007 3:22 PM
To: RE-wrenches at topica.com
Subject: Re: telephone lightning arrestors [RE-wrenches]


Hi Jay, I don't see why a Delta LA302DC wouldn't work. Telephones run on 25 
volts A/C I believe and a LA302 would clamp the voltage to ground if it got 
above that substantially. If they work on 24vdc why not a telephone system.

Carl Hansen 


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